404 Dr. J. E. Gray on the Arrangement of the Families One specimen only of what I believe to be a recent species of Bellerophina has occurred to me, from the middle of the Indian Ocean. From the general appearance of the shell, I should be inclined to place the Bellerophontidse after the family Atlantidse, among the Heteropods. Genus Litiopa, Rang. The species of Litiupa of Rang, or Bombyxinus of Belanger and of Lesson^ are not well known. One is named saxicola, another pelagica; but there is much confusion attending them. About a dozen species have been described, but require to be brought together and compared. This from the Indian Ocean appears to be different from the others, and may be thus charac-terized : — Litiopa venti'osa, A. Adams. L. testa ovato-conoidali, tenui, cornea, semipellucida, longitudinaliter minutissime striata; spira elata, apice obtuse; anfractibus 4g, convexis, ultimo ventricoso, basi producta ; apertura ovata ; labio recto, antice truncato ; labro margine regulariter arcuate. Hab. Indian Ocean. There was no Sargassum in the sea whei'e this species was taken in the towing-net. It is a somewhat inflated, thin, horny shell, with the inner lip abruptly truncate, and the outer lip continued beyond the truncature, so that the aperture cannot be said to be truncate anteriorly. Shanghai, China, May 3, 1861. XLI. — On the Arrangement of the Families and Genera o/Chloro-spermous Algae, By Dr. John Edward Gray, F.R.S., V.P.Z.S., F.L.S. &c. Having been recommended to change the course of my studies for a time, I have returned to my " old love," and have been devoting my vacation and my leisure time to the study of Algce t.nd the reading of the various books and papers on the subject which have come in my way. Thus, after an interval of forty years, I have ventured to prepare a paper on systematic botany, and to send to the ' Annals' some suggestions as to the arrange-ment of the Chlorospermous Algae. I always look back with pleasure to the time that I spent in collecting plants and in studying and teaching botany, and especially to the period when I was occupied in preparing the Bcieutific part of the ' Natural Arrangement of British Plants/
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